Add a more complex sample of stretchy embellished operator.
Add a more complex sample of stretchy embellished operator.

wavewave/lasem,gjtorikian/lasem,gjtorikian/lasem,janmarthedal/mathml2svg,janmarthedal/mathml2svg,janmarthedal/mathml2svg,wavewave/lasem,gjtorikian/lasem,wavewave/lasem,gjtorikian/lasem,wavewave/lasem,janmarthedal/mathml2svg